Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Utility Patent
1999-07-13
2001-01-02
Dinh, Tan (Department: 2752)
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
C369S053130
Utility Patent
active
06169710
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical disc recording/reproducing method and apparatus as well as to a medium containing an optical disc recording/reproducing program and in particular, to an optical disc recording/reproducing method capable of performing a defect processing.
2. Description of the Related Art
Conventionally, there has been an optical disc apparatus having a defect function during a data writing. That is, when an access is made to an address X of an optical disc for writing a data, if a data write error is caused, an alternative address Y is assigned instead of the address X, so that a data to be recorded in address X is recorded in the address Y. When an access is made to the address X during a read operation, the address Y is addressed instead of the address X so as to read out a necessary data. Thus, use of a bad spot on the optical disc is eliminated, thus improving the reliability of the optical disc.
The optical disc has a recording area including: a user area for recording and reproducing a normal data onto/from the optical disc; a spare area allocated for defect processing, a defect management area (DMA) for recording the correspondence between the user area address and the spare area address. In this case of defect processing, an address Y of the spare area is used instead of the address X of the user area. The information that the address X is replaced by the address Y is recorded in the DMA.
On the other hand, there is a case a data item which has been correctly written during a write process may cause an error when being read out. In this case, the optical disc apparatus performs retry of the data read out, thus enabling to read out a necessary data and assuring reliability of data read out.
However, if the address requiring retry is repeatedly accessed during a data read, this significantly lowers a throughput of the optical disc apparatus.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an optical disc recording/reproducing method and apparatus for suppressing the throughput lowering due to repeated retries caused by a read out error.
Another object of the present invention is to provide and an optical disc apparatus and method capable of preventing lowering of a throughput and increasing the data reliability when reproducing an optical disc which has been used in an apparatus causing a number of read errors.
The present invention provides a data recording/reproducing method for recording/reproducing a data to/from an optical disc using an optical disc recording/reproducing apparatus comprising: an optical head block for recording and reading a data to/from the optical disc; a tracking block for positioning the optical head on a predetermined track of the optical disc; a control block for controlling operation of the optical head block and the tracking block according to an instruction from an upper-node apparatus; and a memory for temporarily recording a data required for control, the method comprising steps of: monitoring a read out error during a data read by the optical head block from an address X of the optical disc; executing a read out retry by the optical head from the address X and each time retry is performed, storing the retry count in the memory; reading out the retry count from the memory so as to be compared to a predetermined value if the read out from the address X has been successful; if the retry count exceeds the predetermined value, allocating an alternative address Y on the optical disc to replace the address X, and copying the data which has been read out from the address X, onto address Y; and rewriting a defect management area (DMA) of the optical disc so that a data is read out from the address Y when an instruction is received from an upper node apparatus for reading out from the address X.
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Dinh Tan
Hayes, Soloway, Hennessey, Grossman & Hage
NEC Corporation
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